Thank you for your response :D I did use a dip test for the water testing, and I tested a few times through the cycle, once before adding the fish, and once after. Then I checked after their passing. I dont think anything contaminated the tank, but maybe a small amount of window cleaner got in...
No missing scales :( they went from swimming around one day to just laying in the gravel, dead. No blood, or signs of fighting, so in very puzzled about what happened. I might get my water tested at the pet store, just for a second opinion, but I'm not sure what to do :(
I'm not exactly new to the hobby, but I am new to mollies, and something just keeps going wrong. I have a large 20 gallon tank that is partially planted. Currently, there is a small cory catfish and a zebra nerite snail inside. It's been cycled for well over 3 months (the catfish was from a...